gcc/rust/ChangeLog:

	* backend/rust-compile-base.cc (get_attributes):
	(get_trait_name):
	* util/rust-attributes.cc (Attributes::get_attributes):
	(Attributes::get_trait_name):
	* util/rust-attributes.h:

Signed-off-by: Om Swaroop Nayak <96killerat96@gmail.com>

gcc/rust/backend/rust-compile-base.cc

@@ -33,6 +33,7 @@
 #include "rust-compile-implitem.h"
 #include "rust-attribute-values.h"
 #include "rust-immutable-name-resolution-context.h"
+#include "rust-attributes.h"
 
 #include "fold-const.h"
 #include "stringpool.h"
@@ -158,64 +159,6 @@ HIRCompileBase::handle_attribute_proc_macro_attribute_on_fndecl (
   ctx->collect_attribute_proc_macro (fndecl);
 }
 
-static std::vector<std::string>
-get_attributes (const AST::Attribute &attr)
-{
-  std::vector<std::string> result;
-
-  rust_assert (attr.get_attr_input ().get_attr_input_type ()
-	       == Rust::AST::AttrInput::TOKEN_TREE);
-  const auto &tt
-    = static_cast<const AST::DelimTokenTree &> (attr.get_attr_input ());
-
-  // TODO: Should we rely on fixed index ? Should we search for the
-  // attribute tokentree instead ?
-
-  // Derive proc macros have the following format:
-  // #[proc_macro_derive(TraitName, attributes(attr1, attr2, attr3))]
-  //                    -~~~~~~~~ - ~~~~~~~~~~---------------------
-  //                    ^0  ^1    ^2     ^3           ^4
-  // - "attributes" is stored at position 3 in the token tree
-  // - attribute are stored in the delimited token tree in position 4
-  constexpr size_t attr_kw_pos = 3;
-  constexpr size_t attribute_list_pos = 4;
-
-  if (tt.get_token_trees ().size () > attr_kw_pos)
-    {
-      rust_assert (tt.get_token_trees ()[attr_kw_pos]->as_string ()
-		   == "attributes");
-
-      auto attributes = static_cast<const AST::DelimTokenTree *> (
-	tt.get_token_trees ()[attribute_list_pos].get ());
-
-      auto &token_trees = attributes->get_token_trees ();
-
-      for (auto i = token_trees.cbegin () + 1; // Skip opening parenthesis
-	   i < token_trees.cend ();
-	   i += 2) // Skip comma and closing parenthesis
-	{
-	  result.push_back ((*i)->as_string ());
-	}
-    }
-  return result;
-}
-
-static std::string
-get_trait_name (const AST::Attribute &attr)
-{
-  // Derive proc macros have the following format:
-  // #[proc_macro_derive(TraitName, attributes(attr1, attr2, attr3))]
-  //                    -~~~~~~~~ - ~~~~~~~~~~---------------------
-  //                    ^0  ^1    ^2     ^3           ^4
-  // - The trait name is stored at position 1
-  constexpr size_t trait_name_pos = 1;
-
-  rust_assert (attr.get_attr_input ().get_attr_input_type ()
-	       == Rust::AST::AttrInput::TOKEN_TREE);
-  const auto &tt
-    = static_cast<const AST::DelimTokenTree &> (attr.get_attr_input ());
-  return tt.get_token_trees ()[trait_name_pos]->as_string ();
-}
 
 void
 HIRCompileBase::handle_derive_proc_macro_attribute_on_fndecl (
@@ -225,7 +168,7 @@ HIRCompileBase::handle_derive_proc_macro_attribute_on_fndecl (
 
   attr.get_attr_input ().parse_to_meta_item ();
   CustomDeriveInfo macro
-    = {fndecl, get_trait_name (attr), get_attributes (attr)};
+    = {fndecl, Attributes::get_trait_name (attr), Attributes::get_attributes (attr)};
   ctx->collect_derive_proc_macro (macro);
 }
 

gcc/rust/util/rust-attributes.cc

@@ -37,6 +37,64 @@ Attributes::is_known (const std::string &attribute_path)
 
   return !lookup.is_error ();
 }
+static std::vector<std::string>
+Attributes::get_attributes (const AST::Attribute &attr)
+{
+  std::vector<std::string> result;
+
+  rust_assert (attr.get_attr_input ().get_attr_input_type ()
+	       == Rust::AST::AttrInput::TOKEN_TREE);
+  const auto &tt
+    = static_cast<const AST::DelimTokenTree &> (attr.get_attr_input ());
+
+  // TODO: Should we rely on fixed index ? Should we search for the
+  // attribute tokentree instead ?
+
+  // Derive proc macros have the following format:
+  // #[proc_macro_derive(TraitName, attributes(attr1, attr2, attr3))]
+  //                    -~~~~~~~~ - ~~~~~~~~~~---------------------
+  //                    ^0  ^1    ^2     ^3           ^4
+  // - "attributes" is stored at position 3 in the token tree
+  // - attribute are stored in the delimited token tree in position 4
+  constexpr size_t attr_kw_pos = 3;
+  constexpr size_t attribute_list_pos = 4;
+
+  if (tt.get_token_trees ().size () > attr_kw_pos)
+    {
+      rust_assert (tt.get_token_trees ()[attr_kw_pos]->as_string ()
+		   == "attributes");
+
+      auto attributes = static_cast<const AST::DelimTokenTree *> (
+	tt.get_token_trees ()[attribute_list_pos].get ());
+
+      auto &token_trees = attributes->get_token_trees ();
+
+      for (auto i = token_trees.cbegin () + 1; // Skip opening parenthesis
+	   i < token_trees.cend ();
+	   i += 2) // Skip comma and closing parenthesis
+	{
+	  result.push_back ((*i)->as_string ());
+	}
+    }
+  return result;
+}
+
+static std::string
+Attributes::get_trait_name (const AST::Attribute &attr)
+{
+  // Derive proc macros have the following format:
+  // #[proc_macro_derive(TraitName, attributes(attr1, attr2, attr3))]
+  //                    -~~~~~~~~ - ~~~~~~~~~~---------------------
+  //                    ^0  ^1    ^2     ^3           ^4
+  // - The trait name is stored at position 1
+  constexpr size_t trait_name_pos = 1;
+
+  rust_assert (attr.get_attr_input ().get_attr_input_type ()
+	       == Rust::AST::AttrInput::TOKEN_TREE);
+  const auto &tt
+    = static_cast<const AST::DelimTokenTree &> (attr.get_attr_input ());
+  return tt.get_token_trees ()[trait_name_pos]->as_string ();
+}
 
 using Attrs = Values::Attributes;
 

gcc/rust/util/rust-attributes.h

@@ -29,6 +29,8 @@ class Attributes
 {
 public:
   static bool is_known (const std::string &attribute_path);
+  static std::vector<std::string> get_attributes (const AST::Attribute &attr);
+  static std::string get_trait_name (const AST::Attribute &attr);
 };
 
 enum CompilerPass